Spring Design – Change in Diameter with Compression
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Re: Spring Design – Change in Diameter with Compression
Re: Spring Design – Change in Diameter with Compression -- jalipa	Post Reply	Top of thread	Forum

Posted by: gfought ® 09/24/2003, 09:00:13 Author Profile Mail author Edit

I have checked several of my references and I don't recall seeing anything on the change in outside diameter of a compression spring under load. There are manufacturing tolerances that you have to allow for in your design that could be more or less 3-4%. eFunda is a good site for reference...

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Re: Spring Design – Change in Diameter with Compression
Re: Re: Spring Design – Change in Diameter with Compression -- gfought	Post Reply	Top of thread	Forum

Posted by: jalipa ® 09/25/2003, 03:41:59 Author Profile Mail author Edit

I now have several formulas:- For a compression spring which has ends that are prevented from unwinding during compression the formula for expansion on diameter is as follows:-      change in dia= 0.05 * (p^2-d^2)/D      where d = wire dia            D = mean dia of coils            p = pitch of the coils when spring is in its                free state  formula represents spring going from free height to solid  length. Alternative version of the formula (from an Italian Spec....don't ask):- change in dia = p^2-d^2/20D and change in dia = p^2-0.8d^2pd – 0.2 d^2/10D J.

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